SUSE-SU-2026:2786-1: important: Security update for xorg-x11-server

[SLE-SECURITY-UPDATES]

# Security update for xorg-x11-server

Announcement ID: SUSE-SU-2026:2786-1  
Release Date: 2026-07-08T07:16:51Z  
Rating: important  
References:

  * bsc#1268893
  * bsc#1268894

  
Cross-References:

  * CVE-2026-55999
  * CVE-2026-56000

  
CVSS scores:

  * CVE-2026-55999 ( SUSE ):  7.3
    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-55999 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-55999 ( NVD ):  8.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
  * CVE-2026-56000 ( SUSE ):  7.3
    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-56000 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-56000 ( NVD ):  9.0
    CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

  
Affected Products:

  * openSUSE Leap 15.6
  * SUSE Linux Enterprise Server 15 SP6
  * SUSE Linux Enterprise Server 15 SP6 LTSS
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6

  
  
An update that solves two vulnerabilities can now be installed.

## Description:

This update for xorg-x11-server fixes the following issues

  * CVE-2026-55999: missing bounds check in `glamor_font_get` can lead to a heap
    buffer overflow when a font loaded from a malicious PCF file is processed
    (bsc#1268893).
  * CVE-2026-56000: improper memory management in `CommonMakeCurrent` can lead
    to a heap use-after-free when an interaction with a malicious client
    creating GLX contexts happens (bsc#1268894).

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise Server for SAP Applications 15 SP6  
    zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-2786=1

  * openSUSE Leap 15.6  
    zypper in -t patch SUSE-2026-2786=1

  * SUSE Linux Enterprise Server 15 SP6 LTSS  
    zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-2786=1

## Package List:

  * SUSE Linux Enterprise Server 15 SP6 LTSS (aarch64 ppc64le s390x x86_64)
    * xorg-x11-server-sdk-21.1.11-150600.5.31.1
    * xorg-x11-server-extra-debuginfo-21.1.11-150600.5.31.1
    * xorg-x11-server-extra-21.1.11-150600.5.31.1
    * xorg-x11-server-Xvfb-debuginfo-21.1.11-150600.5.31.1
    * xorg-x11-server-debugsource-21.1.11-150600.5.31.1
    * xorg-x11-server-debuginfo-21.1.11-150600.5.31.1
    * xorg-x11-server-21.1.11-150600.5.31.1
    * xorg-x11-server-Xvfb-21.1.11-150600.5.31.1
  * openSUSE Leap 15.6 (aarch64 i586 ppc64le s390x x86_64)
    * xorg-x11-server-sdk-21.1.11-150600.5.31.1
    * xorg-x11-server-extra-debuginfo-21.1.11-150600.5.31.1
    * xorg-x11-server-extra-21.1.11-150600.5.31.1
    * xorg-x11-server-Xvfb-debuginfo-21.1.11-150600.5.31.1
    * xorg-x11-server-debugsource-21.1.11-150600.5.31.1
    * xorg-x11-server-debuginfo-21.1.11-150600.5.31.1
    * xorg-x11-server-21.1.11-150600.5.31.1
    * xorg-x11-server-source-21.1.11-150600.5.31.1
    * xorg-x11-server-Xvfb-21.1.11-150600.5.31.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6 (ppc64le x86_64)
    * xorg-x11-server-sdk-21.1.11-150600.5.31.1
    * xorg-x11-server-extra-debuginfo-21.1.11-150600.5.31.1
    * xorg-x11-server-Xvfb-debuginfo-21.1.11-150600.5.31.1
    * xorg-x11-server-extra-21.1.11-150600.5.31.1
    * xorg-x11-server-debugsource-21.1.11-150600.5.31.1
    * xorg-x11-server-debuginfo-21.1.11-150600.5.31.1
    * xorg-x11-server-21.1.11-150600.5.31.1
    * xorg-x11-server-Xvfb-21.1.11-150600.5.31.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-55999.html
  * https://www.suse.com/security/cve/CVE-2026-56000.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1268893
  * https://bugzilla.suse.com/show_bug.cgi?id=1268894

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